John greek



(No Model.) J. GREEK.

STONE DRILL 0R REAMER.

Patented Sept. 13, 1881..

UNITED STATES PATENT OFFICE.

JOHN GREEK, on EVANSVILLE, INDIANA, ASSIGNOR TO ED ARD A. GREEK,

. OF SAME PLACE.

STONE DRILL OR REAMER.

SPECIFICATION formingpart of Letters Patent No. 247,044, dated September 13, 1881.

Application filed June 20, 1881. (No model.)

To all whom it may concern: able distance from its end, is straight, as seen Be it known that I, JOHN GREEK, of Evansat y, and when the tool is extended to its fullville, in the State of Indiana, have invented est extent will stand at right angles to the certain new and useful Improvements in Stone drill-shaft, and from this point to its inner or 5 Drills or Reamers; and I do hereby declare pivoted end the shank of the tool is turned upthat the following is afull, clear, and exact Ward at an obtuse angle, as seen at 9 and description thereof, reference being had to the rests upon the inclined grooves F F. accompanying drawings, and to the letters of The operation of this drill or reamer may be reference marked thereon, which form part of either a rotary or reciprocating motion, and is 10 this specification, in which as follows: The hole having been drilled as Figurel is aside elevation; Fig.2, a central. usual, the drill is withdrawn and the reamer vertical section; and Figs. 3 and 4, detail perlowered into place with the tools drawn in and spective views of the plug and cutter, respectlying between the guides or bars D D, with ively. their ends resting upon the inclines F F. As 15 My invention has for its object the construcm tiOH is w impart-ed t0 the device the cuttion of a stone drill or reamer which shall comg- 0 8 are forced outward by the said inbine ease of operation,quiokness, and economy clines and cut their way into the rock. At 7 of construction, as well as increased efficiency the same time the Points 119011 the p g E are and to this end it consists in the peculiar conslowly cutting their way downward, and by 2o struction of the cutting tools and such other the time the tools have reached their maXim m points, as will be hereinafter more fully deexpansion the plug has progressed downward scribed. suliticiently to allow the lower edges, g, of the In order to enable others skilled in the art tools to rest upon the bottom of the opening to make and use my invention, I will now proout, which will be at right angles to the drilled 7 25 ceed to describeits construction and operation. 0 ee ba s D D act as gu des, bet ee A represents the drill or reamer shaft, the which the tools work, and also serve as arigid lower extremity of which is enlarged, as seen connection between the plug and the collar at B. Upon the shaft A is a loose collar, 0, upon the shaft A. to which are secured the upper ends of two I am aware that in some reamers a plug is 0 metal guides or bars,DD,which extend downused; but in all such that I have seen the ward parallel to each other for a suitable displug Was separate from the rest of the device, tance, and have secured between their lower and after the hole was drilled a small conical ends the plug E. This plugE is, upon its uphole had to be drilled in the bottom,into which per end, formed with two grooves, F F, whose the plug was lowered,and the reamer then put 8 5 bottoms are inclined in opposite directions, as in place; but this occupies much time, and in seen in Fig. 2, and the purpose of which will my invention no hole need be prepared for the be presently seen. reception of the plug 5 but the whole device is The lower end of the plugEis provided with lowered into place as soon as the drill is retwo or more diamond points, which enable it moved, and the plug eats its way slowly down- 0 0 to cut its way slowly downward. The lower ward,as required to formarjght-angle enlargeextremity of the enlargement B of the reamerment. shaft A is formed with two lugs, b b, between Another important point in myimprovement which arepivoted the cutting-toolsGG. These is the fact that by the peculiar shape of my tools are ot'peculiar form, being formed at their cutting-tools a cavity is formed which is wider 5 outer ends and upper sides with an enlarged at its outer than at its inner sides, thus confinsemicircular cutting-surface, g, which may ing the blasting-charge and giving it an imeither be formed with serrated edges,as shown mense lifting force, enabling it to do much in the drawings, or provided with the usual greater execution. diamond or carbon points, according to the na- The peculiar ball-shaped ends of my cutting- I00 50 ture of the material in which it is to be used. tools also enable them to be made at much The under side of the cutting-tool, for a suitless cost when diamond points are used, as the cutting-surface is very small, compared to that of most bits, which have such surface extending their full length.

It may be found desirable to provide the shaft at some point above the collar with a ball or enlargement of the same diameter as the reamer-head, in order to act as a brace and keep the shaft always perpendicular.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a boring or reaming implement, the combination, with a movable rod or shaft, of cutters pivoted thereto, each of said cutters formed with an enlarged solid head, semicircular on its upper face, and provided with serrations or cutting-teeth, substantially as and for the purpose set forth.

2. The combination, in a boring or reaming implement, of a shaft sliding in a sleeve with a pair of cutters having solid enlarged outer ends, semicircular on their upper faces, with serrations or teeth thereon, and their lower sides opposite the heads formed on a straight line and parallel to the bottom of the plug when the cutters are extended, all substantially as and for the purpose set forth.

3. The combination, in a boring or reaming implement, with a shaft having an enlarged end and sliding within a collar or sleeve, of cutters pivoted to the lower end of said shaft and a plug secured to the collar by means of guides or connecting-braces, said plug being provided with diamond points, all constructed and arranged to operate substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my own I affix my signature in presence of two Witnesses.

JOHN GREEK.

WVitnesses M. S. LYON, OoNvERsE CLEMENT. 

